I have a pair of Castelli tights, and I'm very happy with them. I wear a small in everything else, but those are mediums and they are tight, but they do fit. They are by far the nicest piece of cycling gear that I own. I just wanted to make sure I wasn't overlooking another brand. Also, it seems hard, at least on the internet, to tell which are the "endurance" bibs and which ones are made for a 25 mile race.